On Oct 1 2017, I found out there are no results from the Amazon JP (amazon.co.jp) although I submit any search terms.This worked fine until the middle of September 2017 (as far as I remembered).The following terms are not available : ISBN-10, ISBN-13, Author, Title.But I could get the results from Amazon US by querying these terms.Registering AWS ID and keys is fine.Would you tell me any solutions?